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Dental Material AND Ceramic

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https://www.readbyqxmd.com/read/30099428/-the-reactions-of-lipid-s-free-radical-oxidation-hemocoagulant-properties-of-oral-fluid-in-patients-with-galvanic-currents-in-the-mouth
#1
Yuriy I Sylenko, Tetyana V Perepelova, Maryna V Khrebor, Bohdan Yu Sylenko, Olena A Pysarenko
OBJECTIVE: Introduction: Oral manifestation of galvanic currents due to the presence of two and more dissimilar metals in dental restorations is rather important in prosthodontics. The aim of our study was to assess the reactions lipid's free radical oxidation and hemocoagulant properties of oral fluid in patients with disorders in oral cavity due to galvanic currents. PATIENTS AND METHODS: Materials and methods: The study had got some groups. The first one consisted of 7 healthy patients without dental prosthesis...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
https://www.readbyqxmd.com/read/30096857/hexagonal-boron-nitride-functionalized-with-au-nanoparticles-properties-and-potential-biological-applications
#2
Magdalena Jedrzejczak-Silicka, Martyna Trukawka, Mateusz Dudziak, Katarzyna Piotrowska, Ewa Mijowska
Hexagonal boron nitride is often referred to as white graphene. This is a 2D layered material, with a structure similar to graphene. It has gained many applications in cosmetics, dental cements, ceramics etc. Hexagonal boron nitride is also used in medicine, as a drug carrier similar as graphene or graphene oxide. Here we report that this material can be exfoliated in two steps: chemical treatment (via modified Hummers method) followed by the sonication treatment. Afterwards, the surface of the obtained material can be efficiently functionalized with gold nanoparticles...
August 9, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30058467/microhardness-and-water-solubility-of-expired-and-non-expired-shelf-life-composites
#3
Evrim Eliguzeloglu Dalkilic, Nazmiye Donmez, Magrur Kazak, Bugra Duc, Akif Aslantas
BACKGROUND: The aim of this study was to determine the Vickers hardness and water solubility of expired and non-expired shelf-life bulk-fill and conventional dental composite material. METHODS: Four different expired (E) (after 6 months) and non-expired (N) shelf-life composite resin materials (Clearfil Majesty ES-2 Enamel, Clearfil Majesty ES-2 Dentin, Tetric N-Ceram Bulk-Fill, and Tetric N-Ceram) were used. For each tested material, seven specimens were prepared and polymerized with a light curing unit...
July 30, 2018: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/30046484/solid-electrolytes-based-on-1-x-y-zro-2-x-mgo-y-cao-ternary-system-preparation-characterization-ionic-conductivity-and-dielectric-properties
#4
Nazli Zeeshan, Rafiuddin
Different composition of composite material of zirconium dioxide co-doped with magnesium oxide [MgO(x)] and calcium oxide [CaO(y)] according to the general molecular formula {1 - (x + y)}ZrO2 -(x)MgO-(y)CaO were prepared by co-precipitation method and characterized by different techniques, such as XRD, FTIR, TG-DTA, and SEM. Co-doping was conducted to enhance the ionic conductivity, as mixed system show higher conductivity than the single doped one. Arrhenius plots of the conductance revealed that the co-doped composition "6Mg3Ca" has a higher conductivity with a minimum activation energy of 0...
January 2018: Journal of Advanced Research
https://www.readbyqxmd.com/read/30037692/randomized-controlled-clinical-trial-of-digital-and-conventional-workflows-for-the-fabrication-of-zirconia-ceramic-posterior-fixed-partial-dentures-part-ii-time-efficiency-of-cad-cam-versus-conventional-laboratory-procedures
#5
Sven Mühlemann, Goran I Benic, Vincent Fehmer, Christoph H F Hämmerle, Irena Sailer
STATEMENT OF PROBLEM: Clinical trials are needed to evaluate the digital and conventional fabrication technology for providing fixed partial dentures (FPDs). PURPOSE: The purpose of the second part of this clinical study was to compare the laboratory production time for tooth-supported, 3-unit FPDs by means of computer-aided design and computer-aided manufacturing (CAD-CAM) systems and a conventional workflow. In addition, the quality of the 3-unit framework of each treatment group was evaluated clinically...
July 20, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30029078/labial-repositioning-using-polymethylmethracylate-pmma-based-cement-for-esthetic-smile-rehabilitation-a-case-report
#6
Toni Arcuri, Maykson Feitosa Pereira da Costa, Iury Machado Ribeiro, Byron Daia Barreto, João Paulo Lyra eSilva
INTRODUCTION: One of the most common esthetic complaints among dental patients is a gingival smile, which may be of multifactorial etiology, e.g. gingival hyperplasia, skeletal deformities featuring overgrowth of the anterior maxilla, altered passive eruption, maxillary alveolar tooth extrusion, fine lip and hypermobility of lip elevator muscles, which must be diagnosed prior to treatment so that the appropriate management approach can be selected. Maxillary overgrowth may give rise to subnasal skeletal depression where the upper lip retracts to during smiling, causing gingival exposure...
July 17, 2018: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/30017167/trueness-analysis-of-zirconia-crowns-fabricated-with-3-dimensional-printing
#7
Weina Wang, Hai Yu, Yifan Liu, Xinlei Jiang, Bo Gao
STATEMENT OF PROBLEM: The primary manufacturing method of zirconia ceramic crowns is computer-aided design and computer-aided manufacture (CAD-CAM), but a disadvantage of this technique is material waste. Three-dimensional (3D) printing, which has been recently introduced into dentistry, has improved the processing of polymers and metals, but not yet of ceramic crowns. PURPOSE: The purpose of this in vitro study was to evaluate the 3D trueness of zirconia crowns fabricated by 3D printing to investigate the potential application of this technology in dental ceramic restorations...
July 13, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30017165/how-does-the-piston-material-affect-the-in-vitro-mechanical-behavior-of-dental-ceramics
#8
Kátia R Weber, Paula Benetti, Álvaro Della Bona, Pedro H Corazza, Juliana A Medeiros, Ediléia Lodi, Márcia Borba
STATEMENT OF PROBLEM: Variables involving the indication, manufacturing, and clinical use of ceramic restorations make the standardization of in vitro studies a challenge and raise questions as to the clinical validity of the resulting data. PURPOSE: The purpose of this in vitro study was to assess the effect of piston material on the fracture behavior of ceramics tested under compressive load. MATERIAL AND METHODS: Two ceramics were evaluated: a lithium disilicate-based glass-ceramic (D) and a feldspathic porcelain (P)...
July 13, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30015816/-a-phd-completed-innovations-in-restorative-dentistry-necessary-or-superfluous
#9
U Schepke
Restorative dentists are faced with a dilemma: they needs to be aware of the most recent developments in order to be able to offer state-of-the-art care but they also have to be able to identify which of the many innovations are superfluous. In this doctoral dissertation the focus was on the role of digital production and procedures in restorative dentistry, and in oral implantology in particular. The variety of studies performed revealed that patients prefer to have impressions taken digitally rather than with dental impression putty and that digital impressions can be taken more quickly...
July 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/29986293/the-effect-of-artificial-aging-on-martens-hardness-and-indentation-modulus-of-different-dental-cad-cam-restorative-materials
#10
Rüdiger Hampe, Nina Lümkemann, Beatrice Sener, Bogna Stawarczyk
OBJECTIVES: To determine the Martens hardness parameters for five different classes of CAD/CAM restorative materials after storage in water and thermo-cycling. MATERIALS AND METHODS: Lithium disilicate ceramic IPS e.max CAD (EX), silicate ceramic IPS Empress CAD (EC), a polymer infiltrated interpenetrating network material (hybrid material) VITA Enamic (VE), two compact filled composites Lava Ultimate (LU), experimental material (EM), two low filled resin composites Katana Avencia (KA), Ambarino High-Class (AH) and ultra-low/unfilled acrylic polymers CAD-Temp (CT), Telio CAD (TC), breCAM...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29985324/oral-biofilm-formation-on-different-materials-for-dental-implants
#11
Thalisson S O Silva, Alice R Freitas, Marília L L Pinheiro, Cássio do Nascimento, Evandro Watanabe, Rubens F Albuquerque
Dental implants and their prosthetic components are prone to bacterial colonization and biofilm formation. The use of materials that provides low microbial adhesion may reduce the prevalence and progression of peri-implant diseases. In view of the oral environment complexity and oral biofilm heterogeneity, microscopy techniques are needed that can enable a biofilm analysis of the surfaces of teeth and dental materials. This article describes a series of protocols implemented for comparing oral biofilm formation on titanium and ceramic materials for prosthetic abutments, as well as the methods involved in oral biofilms analyses at the morphological and cellular levels...
June 24, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29983817/recent-advances-in-material-and-geometrical-modelling-in-dental-applications
#12
REVIEW
Waleed M S Al Qahtani, Salah A Yousief, Mohamed I El-Anwar
This article touched, in brief, the recent advances in dental materials and geometric modelling in dental applications. Most common categories of dental materials as metallic alloys, composites, ceramics and nanomaterials were briefly demonstrated. Nanotechnology improved the quality of dental biomaterials. This new technology improves many existing materials properties, also, to introduce new materials with superior properties that covered a wide range of applications in dentistry. Geometric modelling was discussed as a concept and examples within this article...
June 20, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29975849/a-functionally-graded-picn-material-for-biomimetic-cad-cam-blocks
#13
M Eldafrawy, J F Nguyen, A K Mainjot, M J Sadoun
The objective of this study was to introduce a functionally graded (FG) polymer-infiltrated ceramic network (PICN) block, characterized by a gradient of mechanical properties, as a biomimetic material for computer-aided design and manufacturing (CAD-CAM) prostheses. FG-PICN blocks were manufactured from a slurry of glass-ceramic powder, which was subsequently centrifuged and sintered. The ceramic network was infiltrated with urethane dimethacrylate and polymerized under high temperature-pressure. Blocks were sectioned into 9 layers, and each layer was subsequently cut into 3 samples...
July 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29960248/influence-of-microscale-expansion-and-contraction-caused-by-thermal-and-mechanical-fatigue-on-retentive-strength-of-cad-cam-generated-resin-based-composite-crowns
#14
Shuhei Ankyu, Keisuke Nakamura, Akio Harada, Ryoichi Inagaki, Yusuke Katsuda, Taro Kanno, Yoshimi Niwano, Ulf Örtengren, Hiroshi Egusa
CAD/CAM-generated resin-based composite crowns have been proposed as an inexpensive alternative to conventional crowns. However, concerns have been raised about crown loosening in clinical use. Therefore, the present in vitro study aimed to evaluate the influence of thermal and mechanical cycling (TC and MC) on retentive strength of CAD/CAM resin-based crowns in relation to microscale expansion and contraction caused by fatigue. Eighty standardized dies were produced using a resin-based composite material. Crowns were milled from resin-based composite (n = 40) and glass-ceramic blocks (n = 40; control) using a dental CAD/CAM system...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29957447/evaluation-of-the-micro-mechanical-and-bioactive-properties-of-bioactive-glass-dental-porcelain-composite
#15
Anastasia Beketova, Savvas Varitis, Eleana Kontonasaki, Triantafillia Zorba, Lambrini Papadopoulou, Nikolaos Kantiranis, Georgios S Theodorou, Konstantinos M Paraskevopoulos, Petros Koidis
The aim of this study was to evaluate microhardness and elastic modulus of a novel sol-gel derived dental ceramic - 58S bioactive glass composite (BP67: Bioactive Glass:33.3%, Dental Ceramic:66.7%) BP671 material by micro-indentation and to investigate its microstructure and bioactivity. The research hypotheses were that the values of microhardness (1) and elastic modulus (2) of the novel bioceramic composite and the commercial dental ceramic will be of the same order. The experimental sol-gel derived ceramics showed similar microstructural characteristics to a commercial feldspathic porcelain, and presence of additional calcium phosphate phases, which contributed its bioactivity...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29935769/endocrown-restorations-influence-of-dental-remnant-and-restorative-material-on-stress-distribution
#16
João Paulo Mendes Tribst, Amanda Maria de Oliveira Dal Piva, Camila Ferreira Leite Madruga, Marcia Carneiro Valera, Alexandre Luiz Souto Borges, Eduardo Bresciani, Renata Marques de Melo
OBJECTIVE: The goal of this study was to evaluate the stress distribution in a tooth/restoration system according to the factors "amount of dental remnant" (3 levels) and "restorative material" (2 levels). METHODS: Three endodontically treated maxillary molars were modeled with CAD software for conducting non-linear finite element analysis (FEA), each with a determined amount of dental remnant of 1.5, 3, or 4.5mm. Models were duplicated, and half received restorations in lithium disilicate (IPS e...
June 20, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29933233/the-cu-containing-tio-2-coatings-with-modulatory-effects-on-macrophage-polarization-and-bactericidal-capacity-prepared-by-micro-arc-oxidation-on-titanium-substrates
#17
Qianli Huang, Xuezhong Li, Tarek A Elkhooly, Xujie Liu, Ranran Zhang, Hong Wu, Qingling Feng, Yong Liu
The implant materials with both osteogenic and anti-bacterial properties are promising for orthopedic and dental applications. Moreover, the inflammatory response induced by biomaterials has been recently recognized as one of the critical factors in determining implantation fate. A new generation of implant materials should have modulatory effects on the local inflammatory environment such that it favors osteogenesis and osteointegration instead of being bio-inert. In this study, the micro-arc oxidation (MAO) technique was employed to fabricate Cu-containing ceramic coatings on titanium substrates...
June 19, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29930787/stress-distribution-in-premolars-restored-with-inlays-or-onlays-3d-finite-element-analysis
#18
Hongso Yang, Chan Park, Jin-Ho Shin, Kwi-Dug Yun, Hyun-Pil Lim, Sang-Won Park, Hyunju Chung
PURPOSE: To analyze stress distribution in premolars restored with inlays or onlays using various materials. MATERIALS AND METHODS: Three-dimensional maxillary premolar models of abutments were designed to include the following: 1) inlay with O cavity (O group), 2) inlay with MO cavity (MO group), 3) inlay with MOD cavity (MOD group), and 4) onlay (ONLAY group). A restoration of each inlay or onlay cavity was simulated using gold alloy, e.max ceramic, or composite resin for restoration...
June 2018: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29930240/effects-of-prosthetic-material-and-framework-design-on-stress-distribution-in-dental-implants-and-peripheral-bone-a-three-dimensional-finite-element-analysis
#19
Hakan Arinc
BACKGROUND The purpose of this study was to evaluate the effects of prosthetic material and framework design on the stress within dental implants and peripheral bone using finite element analysis (FEA). MATERIAL AND METHODS A mandibular implant-supported fixed dental prosthesis with different prosthetic materials [cobalt-chromium-supported ceramic (C), zirconia-supported ceramic (Z), and zirconia-reinforced polymethyl methacrylate (ZRPMMA)-supported resin (ZP)] and different connector widths (2, 3, and 4 mm) within the framework were used to evaluate stress via FEA under oblique loading conditions...
June 22, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29898029/fatigue-strength-of-several-dental-ceramics-indicated-for-cad-cam-monolithic-restorations
#20
Gabriela Nishioka, Catina Prochnow, Aline Firmino, Marina Amaral, Marco Antonio Bottino, Luiz Felipe Valandro, Melo Renata Marques de
This in vitro study evaluated the fatigue strength of different ceramic materials indicated for monolithic restorations. Disc-shaped specimens were made according to ISO 6872 from five different ceramic materials: feldspathic ceramic (FC), polymer-infiltrated ceramic network (PIC), lithium disilicate glass-ceramic (LD), zirconia-reinforced lithium silicate glass-ceramic (ZLS), and high translucent tetragonal zirconia polycrystals doped by yttrium (YZ-HT). After obtaining the mean of each material (n = 5) from monotonic load-to-failure tests, specimens (n = 20) were subjected to fatigue tests (staircase method) using a biaxial flexural setup (piston-on-three-balls), to determine the fatigue strength...
June 11, 2018: Brazilian Oral Research
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